SU1626346A1 - Random train generator - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to enhance the functionality of the random pulse stream generator by allowing the random modulation law of the generated pulse stream to be specified. Into the generator of a random stream of pulses, the series-connected element AND 20, the delay element 21, the element 22 and the sensor 23 of random numbers, as well as the trigger 24, are introduced to control the modulating flow of pulses. In addition, the generator contains sensors 1, 9 and 13 random numbers, digital-to-analog converters 2 and 8, blocks 3, 7 and 14 of the comparison, shapers 4 and 10 pulses, sensors 5 and 6 of exponential voltage, elements 11 and 16. EPR elements OR 12 and 25, D-flip-flop 15, delay elements 17 and 28, code bus group 18, modulating pulse shaping unit 19, pulse counter 26, multiplexer 2.7, switch group 29.1-29.m, and channel selection unit 30. 2 Il. fe Yo-Ou ON SO Ochu

Description

The invention relates to a pulse technique, can be used in information and measuring technology and is an improvement of the invention according to the authors. Ev, No. 1552361.

The purpose of the invention is to expand the functionality of the generator by allowing the random law of modulation of the generated stream of pulses to be specified.

Fig. 1 shows a structural electrical circuit of a random pulse generator; in fig. 2 is a diagram of an example of a specific implementation of a channel selection block.

The random pulse flow generator contains serially connected first random number sensor 1, first digital-to-analog converter 2, first comparison unit 3 and first pulse generator 4, first exponential voltage sensor 5, serially connected second exponential voltage sensor 6 and second comparison unit 7 , the second input of which is connected to the output of the second digital-to-analog converter 8, the input of which is connected to the output of the second sensor 9 random numbers, the second driver 10 impulses Bits, serially connected the first gold AND 11, the element OR 12, the third sensor 13 random numbers, the third block 14 comparison, D-flip-flop 15 and the second element And 16, the first delay element 17, a group of code buses 18 connected to the second group inputs of the modulating pulse shaping unit 19, the third element AND 20 sequentially connected, the second delay element 21, the fourth element 22 and the fourth random number sensor 23, the trigger 24, the first and second outputs of which are connected respectively to the second input of the fourth element 22 and 22 with the first input of the third element AND 20, the second input and output of which are connected respectively to the output of the second element AND 16 and to the first input of the trigger 24, the second input of which is connected to the first input of the element OR 12, the output of which is connected to the input of the first sensor 1 random numbers , with the input of the first exponential voltage sensor 5, with the input of the second exponential voltage sensor 6, with the input of the second sensor 9 random numbers and with the input of the first delay element 17, the output of which is connected to the second input of the D-flip-flop 15, the second output coupled to a first input of the first AND gate 11, a second input coupled to an output of the first pulse shaper 4.

The output of the second comparison unit 7 is connected to the input of the second pulse generator 10, the output of which is connected to the second input of the second element AND 16, the output of which is connected to the second input of the OR 12 element and to the first input of the block 19 forming a modulating flow of pulses, the second input of which is connected to the first the input element OR 12. The outputs of the fourth sensor 23 random numbers are connected to the first group of inputs of the block 19 forming a modulating flow of pulses, the group of outputs of which is connected to the second group of inputs of the third block 14 comparison. The output of the exponential voltage sensor 5 is connected to the second input of the first comparison unit 3.

The modulating pulse shaping unit 19 contains a serially connected element OR 25, a pulse counter 26 and a multiplexer 27, a delay element 28 whose output is connected to the first input of the OR element 25, the second input of which is the first input of the modulating pulse shaping unit 19, the first input which is connected to the input of the pulse counter 26, the output of which is connected to the input of the delay element 28.

The multiplexer 27 contains a group of switches 29.1-29.t connected to the inputs of the channel selection block 30.

Channel selection block 30 (Fig. 2) comprises a series-connected decoder 31, a group of OR blocks 32.1-32.m, AND block group 33.1-33.m, and an OR block 34, whose outputs are outputs of the channel selector 30, The first and second groups of outputs of which are the inputs of the decoder 31 and the group of blocks 33.1-33.m of the elements I.

The generator of a random stream of pulses works as follows.

A pulse counter 26 of the modulating pulse modulation generating unit 19 is set to the initial zero state. A trigger 24 is also set to the zero state. The first and second sensors 1 and 9 of random numbers, when a pulse is applied to their input (polling) from the output of the element OR 12, generate independent uniformly distributed random numbers.

At the outputs of the first and second digital-to-analog converters 2 and 8, analog signals are formed, the amplitudes of which are proportional to the random numbers generated. Synchronously with the first and second sensors 1 and 9 random numbers are included the first and second sensors

5 and 6 exponential voltage, the amplitudes of the output signals of which increase according to exponential laws. The choice of exponential laws is determined in accordance with the required parameters of a random stream of pulses generated by the device. At the same time, the first exponential voltage sensor 5 produces a voltage corresponding to the parameters of the law of distribution of the main pulse stream. Second sensor

An exponential voltage produces a voltage that is used to generate a Poisson pulse stream that changes (modulates) the distribution of the main pulse stream. The signals from the outputs of the first and second sensors 5 and 6 of the exponential voltage, as well as from digital-to-analog converters 2 and 8, are fed to the first and second blocks 3 and 7 of the comparison, respectively. At the moments of equality of the voltages supplied to the first and second inputs of blocks 3 and 7 of the comparison, each of these blocks of comparison generates a signal, which then flows respectively to the first and second drivers 4 and 10 pulses.

The passage of a pulse produced by the shaper 4 or shaper 10 pulses to the output of the device is organized in accordance with the required modulation (mixing) law of the main and modulating main streams of pulses. The implementation of the required modulation law is as follows. The next output pulse of the device from the output of the OR 12 element triggers a third sensor of 13 random numbers, from the output of which a binary uniformly distributed number A is fed to the first group of inputs of the third block 14 of the comparison. On the second group of inputs of comparator 14, the number P is determined, which determines the fraction of the modulating flow in the main pulse stream. The selection of a specific value of the number P1, installed at the second input of the comparator unit 14, is made by connecting with the help of the multiplexer 27 the corresponding signal from the group 18 of code buses.

According to the result of comparing the number a with the number P, a single pulse at the output of the comparison block 14 is generated if a P. If a P, t & a pulse comparison unit 14 does not generate a pulse. The output signal from the comparator unit 14 is fed to the first (informational) input of the D-flip-flop 15, to the second input (synchronization) of which the output signal of the device is fed.

The connection to the second group of inputs of the comparison unit 14 of the corresponding signal lines, each set of which belongs to a specific code bus 5 of the group of code buses of the device 18, is provided by the block 19 forming a modulating pulse stream, which operates as follows.

Fidelity P has the following

0 sense: P about the probability of occurrence in the main stream of the next series of modulating pulses; P I is the conditional probability of the occurrence of a second modulating pulse in ser 1 and provided that it has already been

5 one modulating pulse; P j is the conditional probability of the occurrence of a (j + 1) -ro modulating pulse, provided that it was preceded by exactly j consecutive modulating pulses.

0 The selection of the signal bus 18 of the I group of code buses with the probability P J set on it (which correspond to the 1st code bus) and connecting it through the multiplexer 27 to the comparison unit 14 is made

5 by means of a pulse counter 26, the counting input of which is connected to the output of the element I 16 and therefore when a modulating pulse appears; the number in it increases by one. The reset input of the counter 26 pulses is subcontrolled to the output of the element And 11 (through the element OR 25) and therefore the appearance of the pulses of the main flow will turn the counter of pulses into the zero state. Also in zero

The 5th state of the counter 26 1 pulses is also transferred when a number is accumulated in it corresponding to a decrease in the conditional probability P to the level of P. O. Thus, an increase in the contents of the counter 26

0 pulses occur only under the condition of consecutive pulses modulating the main flow.

To ensure the random nature of the changes, the set of probabilities {Pj} i,

5 installed on the signal buses of each of the group of 18 code buses, the third element And 20, the delay element 21, the fourth element 22 and the fourth sensor 23 random numbers 23, and the trigger 2 controlling the multiplexer 27 as follows are entered.

The next impulse of the modulating flow from the output of the element AND 16 comes through the open element AND 20 to the first input (S-input) of the trigger 24. The signal of the new state of the trigger 24 disconnects the element 20 from the output of the element 16 and passes the pulse delayed in the element 21 through an open element And 22 to the input of the survey

sensor 23 random numbers, which produces a random uniformly distributed number. This random number arrives at the first input group of multiplexer 27, determines the number I for selecting the code bus of group 18. At the same time, the control input of the multiplexer 27 sets the contents of the pulse counter 26 corresponding to the signal bus number j from the corresponding code bus 18.1.

In accordance with the value of number j, each of the group of blocks 29.1-29.p switches to its output the Jth signal bus, which is selected in the channel selection unit 30, which operates as follows.

The random number is fed to the decoder 31 and excites one of its 2 K output tires, where K is the size of the random number representation. Under the condition K m (m is the number of input groups of the decoder 31), the excitation of one of

the first -yy output busbars of the decoder 31 correspond to the case 1 1, the second group from -yy output tires of the decoder 31 corresponds to the case i - 2, etc. This condition is realized by connecting to the control inputs of a group of blocks 33.1-33.m of elements AND of the corresponding groups of outputs of the decoder 31, grouped with the help of elements OR 32.1-32.t.

Claims (1)

. Invention Formula The generator of a random stream of pulses auth. St. NS 1552361. Distinguished by the fact that, in order to expand the functionality of the generator by allowing the random modulation of the generated flow of pulses, it is possible to additionally entered in series the third element And the second delay element, the fourth element And the fourth random number sensor, the trigger, the first and second outputs of which are connected respectively to the second input of the fourth element And and the first input of the third element And, the input and output of which are connected respectively with the release of the second element And with the first input of the trigger, the second the input of which is connected to the output of the first element I, the outputs of the fourth random number sensor are connected to the first group of inputs of the block forming a modulating flow of pulses.  f L